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Abstract

We propose a new way to realize a microfiber optical resonator by implementing the topology of a reef knot using two microfibers. We describe how this structure, which includes 4 ports and can serve as an add-drop filter, can be fabricated. Resonances in an all-silica reef knot are measured and good fits are obtained from a simple resonator model. We also show the feasibility of assembling a hybrid silica-chalcogenide reef knot structure.

Figures (5)

Fig. 1. Schematic showing the different steps for the fabrication of a microfiber reef knot resonator: (a) Drawing of a biconical taper from a standard fiber; (b) Shaping of the biconical taper into a U-shape; (c) Drawing of a microfiber from a standard fiber; (d) Wrapping of the microfiber around the U-shaped biconical taper to form a reef knot.

Fig. 4. Schematic of an add-drop filter with relevant parameters for modeling. For characterization the input port is connected to a supercontinuum source (SC), and the through and drop ports are connected to an optical spectrum analyzer (OSA).

Fig. 5. Example of transmission spectra measured from the through and drop ports of the all-silica microfiber reef knot shown in Fig. 3(a) (colored lines) together with the fit curves (black lines). The fit parameters are K1 = 20.8%, K2 = 46.2%, A = 0.46 and D = 450 μm. See text for details on the model.